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quadratic regression

the following points form a quadratic relationship:  (1, 5.0) (2, 4.4)  (3, 4.3)  (4, 4.2)  (5, 4.6)  (6, 4.8)  (7, 5.4)  (8, 6.2).  The x coordinates are years a company has been in operation and the y coordinates are profit in millions for that ysar.  Use quadratic regression to determine profit in the 4 th year.   A) 6.5 million   B) 4.28 million  C )  4.35 million  D)4.20 million

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1 Answer

Since the x-coordinate is the number of years a company I has been in operation, where x = 4 would be the 4th year. That point is given explicitly, no quadratic regression necessary. It corresponds to the y-coordinate 4.2 which is profit in millions. So, the answer should be D, 4.2 million.